If you want an even more integrated solution that works for many more issues, and replaces the native chamfer entirely.  It's Quad Chamfer by Marius Silaghi.  This modifier is amazing, and being a modifier, you can work with it procedurally in the stack, just like any other modifier.  It can push or pull your chamfer to create convex curved or extruded chamfers, and best part is, it quads the corners beautifully.  Just like the new bevel tool in C4D r15.

It's well worth the price, and I expect this plugin to appear in future versions of Max as a standard tool.

http://www.mariussilaghi.com/products/quad-chamfer-modifier

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